// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/views/drag_utils.h"

#include "ui/gfx/canvas.h"
#include "ui/gfx/display.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/screen.h"
#include "ui/views/widget/widget.h"

namespace {

float GetDeviceScaleForNativeView(views::Widget* widget)
{
    float device_scale = 1.0f;
    if (widget && widget->GetNativeView()) {
        gfx::NativeView view = widget->GetNativeView();
        gfx::Display display = gfx::Screen::GetScreen()->GetDisplayNearestWindow(view);
        device_scale = display.device_scale_factor();
    }
    return device_scale;
}

} // namespace

namespace views {

gfx::Canvas* GetCanvasForDragImage(views::Widget* widget,
    const gfx::Size& canvas_size)
{
    float device_scale = GetDeviceScaleForNativeView(widget);
    return new gfx::Canvas(canvas_size, device_scale, false);
}

} // namespace views
